Liquid level control means



y 6, 1952 J. TEMPERLEY 2,595,731

LIQUID LEVEL CONTROL MEANS Filed Nov. 27, 1945 T a I 1 i1 \9 L v I 4/ e I )0 25 fizz/entom- 1 JOHN TEMPERLEY. 5

Jan.

Afton/7 9g Patented May 6, 1952 LIQUID LEVEL CONTROL MEANS John Temperley, Bury, England, assignor to Walmsleys (Bury) Limited, Bury, England, a

British company Application November 2'7, 1945, Serial No. 631,029 In Great Britain November 29, 1944 Claims. 1

The present invention relates to improvements in weirs and the like liquid level control means.

Although generally applicable, the invention is particularly suitable for use with paper-making machines for the control of stock level in delivery chambers, or again in the control of the level of back-water of the drums of immersed drum paper-making machines.

A weir of adjustable height according to the present invention is formed of a plurality of plates hinged about a horizontal axis which nor mally lie in vertical planes, or substantially so, the lip of one plate being adapted to contact with the tail of another to form a continuous vertical bafile, each individual plate, however, being displaceable about its pivot to vary the effective height of the weir.

The invention is further described with reference to the accompanying drawing showing the invention applied to a paper making machine of the type in which a rotary perforate cylinder is disposed within a stock vat taken by way of example.

Fig. 1 is a plan view of the machine,

Fig. 2 is a sectional end elevation of the machine.

In Fig. 2 is shown a vat I having rotatably mounted within it, a rotary perforated mould drum 2 to the outside surface of which paper pulp stock is fed from a supply conduit 6, having valve control means I. The cylinder 2 and vat I may be of any known form but in the arrangement shown a false base is formed to the vat consisting of a plurality of streamline section valves 5, each individually adjustable, by which streams of auxiliary pulp stock, back water or fresh water fed from a supply conduit 3 controlled by a valve 4 may be fed tangentially into the main stock stream passing between the valves 5 and the drum 2. Overflow of excess liquor and pulp can take place over weir 8 to conduit 9.

When applying the invention to paper making machines, it is preferred to have two adjustable weirs disposed one in each of two chambers I4, these chambers being arranged one at each side of the vat I, as shown in Fig. 1. Thus the level of backwater in the drum 2, the ends of the drum opening into the side chambers I4, is controlled by the weirs disposed in said chambers.

It is also preferred that the end wall I5 of the vat I shall protrude a small amount into the chambers I4 50 as to act as a stop for the plates I0. In this case the height of each individual weir plate It! will be equal to or greater than the distance of the pivot I I from the end wall I 5 of the vat I.

For the purposes of the present description, only one Weir disposed in one chamber I4, win he described.

A weir of adjustable height according to the present invention is formed of a plurality of plates I0 hinged about horizontal axes II which plates normally lie in vertical planes, or substantially so, the lip I2 of one plate being adapted to contact with the tail I3 of another to form a continuous vertical baifie, each individual plate Ill, however, being displaceable about its pivot II to vary the effective height of the weir.

The plates ID are preferably disposed in a chamber I4 provided with a complete or partial closure plate 25, arranged so as to divide the chamber into two portions, the smaller of which leads to an outflow conduit I6 and measuring tank I1 with V notch measuring means I8.

If desired the tail I3 of each plate ID, that is to say each plate around its pivotal axes II may be provided with a partial cylindrical boss I9 of rubber or the like resilient material forming an elastic tight joint with the lip I2 of the next adjoining plate I0. It will consequently be seen that by tilting one or more of said plates about their horizontal axes, the effective height of the weir in the chamber I4 may be adjusted as desired.

It will consequently be seen that in the application of the invention to a submerged papermaking drum 2 within a vat I, the chamber I4 in which the weir plates Ill are disposed is connected to the interior of the mould drum so that by swinging one or more plates I0 about their horizontal axes II, so may the level of the backwater in the mould drum 2 be adjusted.

I declare that what I claim is:

1. A Weir for the control of liquid level including a number of plates, pivots for each of said plates at the bottom edge thereof to enable each plate to be rotated about a horizontal axis, successive axes being spaced apart in a common vertical plane by a distance less than the height of the plate rotatable about the lower of said axes, so that said plates may assume an overlapping disposition, and part-cylindrical bosses of resilient material at the lower edge of each of said plates concentric with the axis of rotation of the respective plate, each plate being independently adjustable about its pivot.

2. A weir for the control of liquid level including a number of plates, pivots for each of said plates at the bottom edge thereof to enable each plate to be rotated about a horizontal axis, successive axes being spaced apart one above the other by a distance less than the height of the plate rotatable about the lower of said axes, so that the plates may assume an overlapping disposition, and sealing means at the bottom edge of each plate parallel to the axis of rotation thereof against which the upper region of the next successive lower plate can abut.

3. A weir for the control of liquid level including a number of plates one above th other, pivots for each of said plates to enable each plate to be rotated about a horizontal axis, successive axes being spaced apart by a distance less than the height of the plate rotatable about the lower of said axes, so that the plates may assume an overlapping disposition, journals for said pivots outside the area of the Weir, and sealing means across each plate at the same level as said pivots, against which sealing means the upper region of the next successive lower plate can abut, said sealing means thus defining the efiective lower edges of said plates.

4. A weir for the control of liquid level including a number of plates one above the other, pivots for each of said plates to enable each plate to be rotated about a horizontal axis, successive axes being spaced apart by a distance less than the height of the plate rotatable about the lower of said axes so that the plates may assume an overlapping disposition, journals for said pivots outside the area of the weir, and resilient, partcylindrical sealing means across each plate at the same level as said pivots, against which sealing means the upper region of the next successive lower plate can abut, said sealing means thus defining the effective lower edges of said plates.

5. A weir for the control of liquid level including a number of plates one above the other, pivots for each of said plates to enable each plate to be rotated about a horizontal axis, successive axes being spaced apart by a distance less than the height of the plate rotatable about the lower of said axes so that the plates may assume an overlapping disposition, journals for said pivots outside. the area of the Weir, and resilient sealing means across each plate at the same level as said pivots and having a semi-cylindrical surface concentric with the axis of rotation of the respective plate, against which sealing means the upper region of the next successive lower plate can abut, said sealing means thus defining the effective lower edges of said plates.

JOHN TEMPERLEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 226,772 Mueller Apr. 20, 1880 312,390 Seiberling Feb. 17, 1885 1,211,229 Pruyn et al. Jan. 2, 1917 1,246,394 Colby Nov. 13, 1917 1,287,239 Cook Dec. 8, 1918 1,526,404 Whittaker Feb. 17, 1925' 1,771,600 Yoder July 29, 1930 1,868,087 Blair July 19,1932

2,055,192 Becher Sept. 22, 1936 2,101,973 Becher Dec. 14, 1937 2,339,711 Lowe et a1 Jan. 18, 1944 2,402,063 Malkin June 11, 1946 FOREIGN PATENTS Number Country Date 575,387 Germany Apr. 27, 1933 

